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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
872589	Regeneron Pharmaceuticals Inc	REGN	Pharmaceutical Preparations (2834)	133444607

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1121404	Sanofi-Aventis	174, Avenue De France Paris I0 75013		No	No	Yes	No
1421144	S.n.c. Nord Du Amerique Sanofi-Aventis	174, Avenue De France Paris I0 75013		No	No	Yes	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, $.001 Par Value	Acquisiton	2010-10-13	1,017,401	$28.00	15,816,953	No	4	P	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See footnote

Footnotes

13,017,401 shares are held directly by sanofi-aventis Amerique du Nord and 2,799,552 of the shares are held directly by Aventis Pharmaceuticals Inc. Sanofi-aventis Amerique du Nord is indirectly wholly owned by sanofi-aventis and Aventis Pharmaceuticals Inc., an indirectly wholly-owned subsidiary of sanofi-aventis, is controlled by sanofi-aventis Amerique du Nord. Accordingly, sanofi-aventis can be deemed to share voting and dispositive power over the shares held directly by sanofi-aventis Amerique du Nord and Aventis Pharmaceuticals Inc. Similarly, sanofi-aventis Amerique du Nord can be deemed to share voting and dispositive power over the shares held directly by Aventis Pharmaceuticals Inc.